 Fasten the screws in the main circuit terminal to prevent sparks caused by screws
loosened due to vibration.
 If necessary, use an inductive filter only at the motor output terminals U/T1, V/T2,
W/T3 of the AC motor drive. Do NOT use phase-compensation capacitors or L-C
(Inductance-Capacitance) or R-C (Resistance-Capacitance), unless approved by
Delta.
 DO NOT connect phase-compensation capacitors or surge absorbers at the output
terminals of AC motor drives.
 Ensure proper insulation of the main circuit wiring in accordance with the relevant
safety regulations.
Main Input Power Terminals
 Do not connect three-phase model to single-phase power. R/L1, S/L2 and T/L3
have no phase-sequence requirement, it can be connected in any sequence.
 The connection between the three-phase AC input power supply and the main
circuit terminals (R/L1, S/L2, T/L3) must be connected with a non-fuse switch. Add
a magnetic contactor (MC) to the power input wiring to cut off power quickly and
reduce malfunction when the AC motor drive protection function activates. Both
ends of the MC should have an R-C surge absorber.
 Use voltage and current within the specification in Chapter 11. Refer to Chapter 11
Specifications for details.
 When using a general GFCI (Ground Fault Circuit Interrupter), select a current
sensor with sensitivity of 200 mA or above and not less than 0.1-second operation
time to avoid nuisance tripping.
 Use shielded wire or conduit for the power wiring and ground the two ends of the
shield wire or conduit.
 Do NOT run and stop AC motor drives by turning the power ON and OFF. Run and
stop AC motor drives by sending RUN and STOP command through the control
terminals or the keypad. If you still need to run and stop AC motor drives by turning
power ON and OFF, do so no more often than ONCE per hour.
 To comply with UL standards, connect the drive to a three-phase three-wire or
three-phase four-wire Wye system of mains power system.
Output terminals for main circuit
 Use well-insulated motor, suitable for inverter operation.
 When the AC drive output terminals U/T1, V/T2, and W/T3 are connected to the
motor terminals U/T1, V/T2, and W/T3 respectively, the motor will rotate
counterclockwise (as viewed on the shaft end of the motor, refer to the pointed
direction in the figure below) upon a forward operation command is received To
permanently reverse the direction of motor rotation, switch over any of the two
motor leads.
Figure 3-1
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